Introduce inheritable Profiles and Managers

- There's always a single Profile choosen
- There are many Managers changing settings
  depending on environment
- Improve and re-use mappings between profiles
- Introduce Steam Profile to be used when
  in Steam Big Picture or Steam Game

SteamController/Profiles/SteamProfile.cs

@@ -0,0 +1,26 @@
+using Nefarius.ViGEm.Client.Targets.Xbox360;
+
+namespace SteamController.Profiles
+{
+    public sealed class SteamProfile : DefaultShortcutsProfile
+    {
+        public override bool Selected(Context context)
+        {
+            return context.Enabled && context.SteamUsesController;
+        }
+
+        public override Status Run(Context context)
+        {
+            // Steam does not use Lizard
+            context.Steam.LizardButtons = false;
+            context.Steam.LizardMouse = false;
+
+            if (base.Run(context).IsDone)
+            {
+                return Status.Done;
+            }
+
+            return Status.Continue;
+        }
+    }
+}